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Novosadov [1.4K]
3 years ago
9

Find the area of the regular pentagon with side 10 cm and an apothem of 7.8 cm.

Mathematics
1 answer:
Amanda [17]3 years ago
6 0

Answer:

78cm

Step-by-step explanation:

multiply 10 and 7.8

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5x + 2/5=x-1/10<br>how to solve.
guapka [62]
5x+2/5=x-1/10

Convert 2/5 and -1/10 to equal fractions.

2/5= 4/10

5x+4/10= x-1/10

Subtract x on both sides.

4x+4/10= 1/10

Subtract 4/10 on both sides. 

4x=-3/10

Divide both sides by 4. 

x=-0.075

I hope this helps!
~kaikers
6 0
3 years ago
Read 2 more answers
Which expressions are equivalent to 8 (negative 10 x + 3.5 y minus 7)? Select two options.
Elza [17]

Question is Incomplete; Complete question is given below.

Which expressions are equivalent to 8 (negative 10 x + 3.5 y minus 7)? Select two options. Negative 80 x + 24.5 y minus 56 Negative 80 x + 28 y minus 56 80 x + 28 y + 56 4 (negative 20 x + 7 y minus 14) Negative 4 (negative 20 x + 7 y minus 14)

Answer:

Negative 80 x + 28 y minus 56

4 (negative 20 x + 7 y minus 14)

Step-by-step explanation:

Given:

8(-10x+3.5y-7)

We need to find the equivalent expression for given expression.

Solution:

8(-10x+3.5y-7)

First we will apply distributive property for given expression.

a(x+y) =ax+ay

So we get;

8\times-10x+8\times3.5y-8\times7\\\\-80x+28y-56

Hence first expression equivalent to given expression is -80x+28y-56.

Now again evaluating the expression we get;

We will take 4 as common factor from the expression we get;

-4\times20x+4\times7y-4\times14\\\\4(-20x+7y-14)

Hence second expression equivalent to given expression is 4(-20x+7y-14).

3 0
3 years ago
Read 2 more answers
A population has a standard deviation of 20.2. What is the standard error of the sampling distribution if the sample size is 169
kykrilka [37]
C. 1.68 is the correct answer
6 0
1 year ago
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A classroom board is 54 inches wide and 36 inches tall. Eva
Lady bird [3.3K]
<h3>Answer:  180 inches</h3>

Work Shown:

L = 54 = length

W = 36 = width

P = 2(L+W) ... perimeter of the rectangle

P = 2(54+36)

P = 2(90)

P = 180

She needs 180 inches of ribbon.

To convert to feet, divide by 12. So 180 inches = 180/12 = 15 feet.

8 0
2 years ago
Annie needs $30 to buy a coat. She has saved $12 and plans to work as a babysitter to earn $6 per hour. Which inequality shows t
algol [13]
Annie's total earnings from her initial savings, $12, and from babysitting should be equal or more than 30. Annie's total earnings from babysitting may be expressed as $6n. The inequality should be,
 
                                           12 + 6n <span>≥ 30

Solving for x,
                                             6n </span><span>≥ 30 - 12
</span><span>
                                        6n </span>≥ 18    ;     n <span>≥ 3
</span><span>
Thus, the answer is the second among the choices. 

</span>
6 0
3 years ago
Read 2 more answers
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